T-Mobile 4G/5G CGNAT vs WireGuard tunnel jitter

Lonnie Abelbeck lists at lonnie.abelbeck.com
Sat Apr 10 16:12:56 UTC 2021

> On Apr 10, 2021, at 10:59 AM, Roman Mamedov <rm at romanrm.net> wrote:
> On Sat, 10 Apr 2021 10:27:23 -0500
> Lonnie Abelbeck <lists at lonnie.abelbeck.com> wrote:
>> I have been testing the T-Mobile Home Internet (4G/5G fixed wireless) service to a Linode VM via WireGuard.
>> The TMHI service uses CGNAT plus an additional NAT in their modem/gateway with a MTU of 1420, so WireGuard is configured with a 1340 MTU.
> Do they provide IPv6? I see mentions that yes, but with incoming connections
> blocked. Might still work for WG.

Hi Roman,

TMHI uses IPv6 for their CGNAT, but AFAIK their current firmware does not support IPv6 on the ethernet ports (I disable their WiFi).

But if (when) they support IPv6, establishing the WireGuard tunnel over IPv6 would be great, and back to a 1420 MTU for WireGuard.


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